Magnets and Vehicles. Vehicles are kinda hard to explain in a generic manner as there are so many different types. You'll need to engineer your own way to add magnets and then line up corresponding washers to be glued onto the foamcore. This step isn't as hard as it seems – just sit down and think things through before charging ahead. However, here are some general tips that might help.

Use Your Head. First off, you are going to need to add magnets somewhere underneath the model where it makes contact with the ground. Chances are you'll find an obvious place to put them after you take a look. In this example (yes, it's an old Rhino – get off my back), it made sense to sink four magnets into the treads. In order to sink the magnets into place, you're going to have to drill. The best way to do this is to progressively widen the hole with numerous drill bits until it fits your magnet. Taking your time will ensure that the model stays in one piece. It's also highly advisable to do this BEFORE you paint the model. Once the holes are drilled properly, carefully glue the magnets in place. Be sure to glue the magnets so that they remain level and all of them touch a flat surface at once. If one of them is off, the model will not magnetize solidly and will wobble a bit. That's bad.